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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f7b9e4d28e9a2a0fac66bf1165d93b55afd9b7ebcbd5688c9d3bec62f2a63003' 
  AND token = 'liUtQSHmJNJk4StJeBAfhoWoCnGpV5VL8AMxiy3Snmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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