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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '49024ef856563db097b256c975fdbc0447dd1cb62083dd607b0cbfd0e340a00b' 
  AND token = 'WPlKp7MCVVSPUc1VdAflx3K1Jb3KycIJ5mYfN+Ej+Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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