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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3d23996e726b0c21ae729671d15a95ab745dd40ac57c7c000e7fbc2c263a734e' 
  AND token = 'CeRARNDOUUNtrF1s4N0x6sNMTpNdt/s7zDeIGyNPcH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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