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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f4bdba90149fccdabaa24608bd7e760d065b90beef7faa2398210a0d19801142' 
  AND token = 'ivPojR+HGVxEUne+lJHuR+e77r6UIbLq1XCwpiYLarE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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