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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '76a504cba61e88e4b7fb1f5cb0988b2bc31d5ff63d06ab571a9019b205d11553' 
  AND token = 'EOo57vex4RHCXxlybpLwtKhD5UATfrfEr1MV4KPuVHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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