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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b1849815a2ed95e15fd5e607f2b2471a853e573b285ff18a7f33bfea824a269e' 
  AND token = 'ACJShQStP5x66E/Qfvoh/AeWknQmaw6CG5Hxi8MkNeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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