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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5db523295dd6ab901502d56a51074ad41494db8c07972023610fe5cf2a844bc8' 
  AND token = 'aARzcntJ2rpWisuSho00vvwt1TW6h35VA+ck20BbnU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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