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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ea59b3e07e9da573dd61996d70428aa7e0fee5cbded6224989f813b435256a9a' 
  AND token = '8eBJ6Sxfp62TevcP3bbIEcavNZmvA3C0BJBGzIjULuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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