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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c9c8abee4c7d9523a85a2c9f2eceac4242eea848f7ad47cf875ae25b0df4b879' 
  AND token = 'zadFiVOvtB09lzI5Gvpi7BfvE98E5BwavuyzESEPQLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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