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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8182ad2294a311c51a136e466df1e01c360be183e3894197ff903a2e250e6f73' 
  AND token = 'mM4uRK+thWjuNyI8d5e1gNs/O3dFePSIL2EGrlFnOQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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