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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c6bddaebe0c3bc6c8b3323a6422562e7677f5d5f35923e9270b545e8675be29f' 
  AND token = 't77ARoFqU5ErqlS6Rt6A+6fp2z2peHuBkE9G7flfPlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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