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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '607656fc973ce2a2660eebdf27a652dcf622517ba54bc8f084c0774c7e398e8c' 
  AND token = 'CJ2EdxEYpnsfeniQqEriWJQqRpW8pCkk0mH4P5oeX7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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