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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ea61e981c9cf932a8ef0d2aad7d796997e89ab2884f5c61c6a6f6cb2871a2183' 
  AND token = '2HjZHN4L/xKjikwNlFe/iA5oihEiJA8bp/oCInnagKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}