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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8ba691d16003d18485ad247d4440e1374a2e3c5302637e4bb2c7449a1adadfc9' 
  AND token = 'bj25RLiFU8N1HH/5NxLnNy70Z4J6pVi1K6siVxou/JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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