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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7908ec24a879f866c99bed57cdf8f2f761ee643951cf7172730c03cea431e083' 
  AND token = 'EyP/g0PTUMU/c1c+FUWqf2sUQRQecc/G422OMhW8Cmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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