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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f0968ceddf743a9e184a4c3037d79d4a1ee2abe441e170abc3853ad805039901' 
  AND token = '/hU3noyBR4z1xQahGPfzf6B+znxWG6/cu51h0aj26z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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